» » »

Cadillac Q&A

Ask Your Question

1991 Cadillac Fleetwood Question: Failed No's toohigh

 

Question

Ices, El Sobrante, CA, March 04, 2011, 21:55
 Rookie

Everything passed except failed smog no's too high

2 Answers
Flag This
  • Answer #1

    March 04, 2011, 23:33
    Profile_thumbnail
     Master

    I believe you need to be looking at reasons your engine is running lean, creating a high amount of oxygen in your exhaust gas. This could be due to an air intake leak, a vacuum leak, or a sluggish oxygen sensor (or two). Some folks change catalytic converters for this - I would not do that unless you find that testing indicates the catalyst efficiency is compromised. Good luck.

    Flag This
  • Reply

    Ices, March 06, 2011, 15:22
     Rookie

    Thanks, I have changed the Oxygen Sensor check for vacuum leaks and do a retest tomorroww.

    Reply
    Flag This
  • Answer #2

    Rainbowauto from Rainbow Auto Center, March 07, 2011, 13:03
     Enthusiast

    Need more inforamtion onthe car,but usually first thing I would suspect is the egr system,timing too far advanced, cataltic converter....good luck

    Reply
    Flag This